Discover Dilemma--Solved?

My Discover interest rate of 0% goes away next month unless I make three purchases a month. I have, therefore, set up an account with iTunes, so that I can buy three songs every month. This way, I only spend $3, I get 3 songs every month, and enjoy the APR. I double-checked with Discover, and this is kosher. I just purchased:
"The Crane Wife pt 3" by The Decemberists
"The Ghost" by I Love You But I've Chosen Darkness
"Hurt" by Johny Cash
Thank you 89.3 The Current for introducing me to these songs, and thank you Discover for the interest rate...
I bought these songs seperately today, but I'm going to check with Discover tomorrow and see if they are charged to my card seperately, or if Apple conglomerates their charges at the end of the day.
This is under $36 in purchases a year, which is under a 1% "interest." I know it's not perfect, but I'm satisfied with it as a stop-gap solution...